Spatial distribution of response along anterior-posterior axis of SII. Graphs obtained from OIS data in the anterior and posterior SII cortical regions evoked by flutter stimulus on the central pad of the two subjects shown in Figure 1. Orientation of segmentation indicated by figurines. Left Panel: Note that the response evoked by the bilateral stimulus is slightly smaller than the response evoked by the contralateral stimulus in the anterior region but larger than the response evoked by the contralateral stimulus in the posterior region. Right Panel: Note that in this case, the absorbance values evoked by the bilateral stimulus is significantly smaller than the response evoked by the contralateral stimulus in anterior SII, but approximates a summation of the ipsilateral and contralateral responses in posterior SII. The range of the responses to bilateral stimulation in anterior SII is typified by these 2 subjects – though the differences between the bilateral and contralateral response ranged from small (as in subject 1) to large (as in Subject 2) the bilateral response under the conditions studied were weaker than the contralateral response for all subjects (n = 6).